A woman pushes a bicycle as pro-Russian rebels stand guard at a checkpoint near a Ukrainian airbase in Kramatorsk
A woman pushes a bicycle as pro-Russian rebels stand guard at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian rebel holds his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel holds his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian rebel holds his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel holds his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian rebels stand guard at a checkpoint near a Ukrainian airbase in Kramatorsk
Pro-Russian rebels stand guard at a checkpoint near a Ukrainian airbase in Kramatorsk, in eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
Russian foreign ministry tells West to halt "destructive" Ukraine policy
UKRAINE-CRISIS/RUSSIA-FOREIGN (URGENT):Russian foreign ministry tells West to halt "destructive" Ukraine policy
A pro-Russian rebel eats cherries from a bottle at a checkpoint near a Ukrainian airbase in Kramatorsk
A pro-Russian rebel eats cherries from a bottle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian separatists aim their rifles at a checkpoint near a Ukrainian airbase in Kramatorsk
Pro-Russian separatists aim their rifles at a checkpoint near a Ukrainian airbase in Kramatorsk, in eastern Ukraine May 2, 2014. Pro-Russian rebels shot down two Ukrainian helicopters on Friday, killing two crew, as troops tightened their siege of separatist-held Slaviansk in what Moscow called a "criminal" assault by Kiev that wrecked hopes of peace. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)